Sprayer



Patented Oct. 25, 1938 UNITED STATES PATENT OFFlCE I SPRAYER. Alexander Goulard, Westfield, N. J.

Application January 8,

3 Claims.

This invention relates to improvements in. the construction of liquid sprayers of. the portable manually-operable type, and more particularly to sprayers of the type described havingan air pump with a one-way valve connection to an .air reservoir chamber which continuously discharges through a liquid aspirating discharge nozzle.

In liquid sprayers of the character described, the pump cylinder and air reservoir chamber are usually formed of drawn metal tubing and the parts soldered together. The air reservoir memher is also usually provided with an extended or drawn neck portion having a threaded extension or ferrule soldered theretorto permit a liquid receptacle to be detachably connected. The dis-- charge nozzle is threaded on a nipple soldered on the discharge end of the reservoir chamber.

soldered connections between these parts have frequently been found unsatisfactory due to the repeated torsional stresses imposed thereon in use when the container is refilled and when other forms of dischargenozzles are substituted. In such sprayers the one-way valve is ordinarily mounted in a diaphragm solderedrinto the discharge end of the pump cylindenwhich construction renders cleaning or repair of the valve difiicult. Such soldered connections also render the whole sprayer relativelyuseless if any of the air conduit parts are ruptured, since the parts ticularity in the claims annexed to and forming.

a part of'this specification. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawing and descriptive matter in which I have illustrated and described a preferred embodiment of my invention.

Of the drawing:

Fig. 1 is an elevation of a liquid sprayer constructed in accordance with my invention;

Fig. 2 is an enlarged sectional'view of a portion of the sprayer shown in Fig. l; and

1938, Serial No. 183,940 (or. sea-s9) Fig. 3 isa transverse section taken on the line 3-3 of Fig. 2. r

The liquid sprayer illustrated comprises a barrel or cylinder ll] formed of seamless brass tubing closed at one end by a plug I I and externally threaded at its opposite end; A rod l2 extends through a central opening in the plug and carries a handle l3 on its projecting end and a plunger I4 on its opposite end. The described parts form a manually-operable air pump, air entering the cylinder through an opening l5 near its closed end. i

The air pump so formed delivers compressed air to an air reservoir chamber 20, preferably defined in accordance with my invention by a die casting 2! of zinc alloy or other suitable metal. The casting 2| has an enlarged circular flange 22 at one end which is internally thread-- 'ed forconnection to the cylinder ID. An annular shoulder 23 is formed at the inner end of the flange 22 against which fits a diaphragm disc 24. The "diaphragm' has a central opening, into which is crimped the'reduced end of a tubular valve body 25. The crimped end of the valve body forms an air inlet 26 and a seat 21 for a ball valve 28 loosely fitting in the valve body. In operation the ball 28 is forced away from the seat 21, during the compression stroke of the plunger l4 and 'is returned thereto by the air pressure in the chamber 20 at the end of the compression stroke. A U-shaped wire 29 extends. through the discharge end of the valve body to form a stop for the ball 28, the wire being held in position on the body by putting its legs under tension. The diaphragm 24 is held against the'shoulder 23 by a suitable washer 30, which fits within the flange 22 and is adapted to be compressed by the end, of the cylinder Ill to form. an air tight joint at this point when these parts are assembled.

The casting 2| is also formed with a depending internally threaded circular flange 3! surrounding an annular shoulder 32 at the outer end of an opening 33' in the bottom of the casting. A washer 34 fits within the flange 3| and against the shoulder 32 to form an air-tight detachable connection for a liquid container 35 having an externally threaded neck 36 at its upper end which extends into the flange 3| and is arranged to compress the washer 34.

The casting 2! is advantageously internally shaped to cause the air chamber 20 to progressively decrease in diameter towards its discharge end and terminate in a short'passage of uniform cross-section Within an integral nipple extension 40. The nipple 40 is externally threaded to fit into a nozzle piece 41. The nozzle piece consists of an internally threaded coupling 42 having an internal annular shoulder 43, a flexible metallic hose 44 secured to the discharge end of the coupling, a threaded nipple 50 secured to the discharge end of the hose, and a nozzle 45 having an axial discharge orifice 46 threaded on the nipple. A flexible metallic tube 41 is arranged within the casting 21 with one end extending through the bottom opening 33 and opening near the bottom of the container 35. The other end of the tube 4'! extends through the nipple 40 in spaced relation to the inner wall of the nipple and is formed with a flanged discharge end 48 which is engaged by the coupling shoulder 43 to close that end of the annular passage between the tube and nipple when the nozzle piece is attached. Holes 49 are formed in the tube 41 adjacent its flanged end. The passage of the air at a high velocity through the holes 49 exerts a suction efiect on that end of the tube 41 causing the liquid in the container 35 to be aspirated and atomized, the atomized liquid and air flowing through the nozzle piece and discharging through the orifice 46.

With the described construction, the operation will be obvious. The plunger is manually reciprocated causing air under pressure to flow past the ball valve into the air reservoir chamber, building up a pressure therein. The compressed air continuously discharges through the nipple and tube openings 49 at a relatively high velocity, causing liquid from the container to flow up the tube M. The liquid is atomized by the high velocity air jets entering the holes 49 and the mixture of air and atomized liquid discharged through the nozzle orifice in any desired direction.

lhe described construction of the sprayer and particularly of the casting 21 substantially increases the strength of the parts most liable to damage, facilitates the replacement of damaged parts and lowers the manufacturing cost by the elimination of all soldered connections, provides effective gasket joints for the connected parts, permits cleaning and repair of the valve, and provides an air flow conduit of a suitable shape for the most effective airflow conditions, while adding little, if any, weight to the device. The flexible nozzle piece construction obviates any need of separate or combination nozzles for obtaining difierent spray angles, while facilitating such adjustments.

While in accordance with the provisions of the statutes I have illustrated and described herein the best form of the invention now known to me, those skilled in the art will understand that changes may be made in the form of the apparatus disclosed without departing from the spirit of the invention covered by my claims, and that certain features of my invention may sometimes be used to advantage without a corresponding use of other features.

I claim:

1. A liquid sprayer comprising an air pump cylinder, means forming an air reservoir chamber, said means consisting of a one-piece casting having a flanged integral extension at one end thereof forming a socket in which said cylinder is detachably received, a one-way air valve assembly removably mounted in said socket, said casting having an integrally formed depending flanged portion, a liquid receptacle detachably connected to said flanged portion, a threaded nipple integrally formed on the opposite end of said casting, a liquid aspirating tube extending from said receptacle to said nipple, and a nozzle piece mounted on said nipple.

2. A liquid sprayer comprising a manually operable air pump having a cylinder, a one-piece casting defining an air reservoir chamber having a flanged integral extension at one end thereof forming a socket in which said cylinder is detachably received, a one-way air valve assembly removably mounted in said socket, said casting terminating at its opposite end in an integrally formed nipple, a liquid receptacle detachably connected to said casting, a liquid aspirating tube extending from the liquid space of said receptacle into said nipple and arranged to define an air passage therein and having a flanged end arranged to close the end of said passage, an air inlet opening in said tube adjacent said flanged end, and a nozzle piece detachably connected to said nipple and constructed to hold said aspirating tube in its passage closing position.

3. A liquid sprayer comprising a manually operable air pump having an elongated cylinder, a one-piece casting defining an elongated air reservoir chamber, said casting having a. flanged integral extension at one end thereof forming an enlarged socket in which said cylinder is detachably received, a one-way valve assembly removably mounted in said socket and held in position therein by said cylinder, said casting terminating at its opposite end in an integrally formed threaded nipple, a liquid receptacle detachably connected to said depending flanged portion, a liquid aspirating tube extending from the liquid space of said receptacle into said nipple and arranged to define an annular air passage therein and having a flanged end arranged to close the end of said passage, an air inlet opening in said tube adjacent its flanged end, and a nozzle piece detachably connected to said nipple and constructed to hold said aspirating tube in its passage closing position.

ALEXANDER GOULARD. 

